javax.swing.text
Class FieldView
- java.lang.Object
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- javax.swing.text.View
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- javax.swing.text.PlainView
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- javax.swing.text.FieldView
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- All Implemented Interfaces:
- SwingConstants, TabExpander
- Direct Known Subclasses:
- PasswordView
public class FieldView extends PlainView
Extends the multi-line plain text view to be suitable for a single-line editor view. If the view is allocated extra space, the field must adjust for it. If the hosting component is a JTextField, this view will manage the ranges of the associated BoundedRangeModel and will adjust the horizontal allocation to match the current visibility settings of the JTextField.- See Also:
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View
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Field Summary
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Fields inherited from class javax.swing.text.View
BadBreakWeight, ExcellentBreakWeight, ForcedBreakWeight, GoodBreakWeight, X_AXIS, Y_AXIS
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Fields inherited from interface javax.swing.SwingConstants
BOTTOM, CENTER, EAST, HORIZONTAL, LEADING, LEFT, NEXT, NORTH, NORTH_EAST, NORTH_WEST, PREVIOUS, RIGHT, SOUTH, SOUTH_EAST, SOUTH_WEST, TOP, TRAILING, VERTICAL, WEST
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Constructor Summary
Constructors Constructor and Description FieldView(Element elem)Constructs a new FieldView wrapped on an element.
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method and Description protected ShapeadjustAllocation(Shape a)Adjusts the allocation given to the view to be a suitable allocation for a text field.protected FontMetricsgetFontMetrics()Fetches the font metrics associated with the component hosting this view.floatgetPreferredSpan(int axis)Determines the preferred span for this view along an axis.intgetResizeWeight(int axis)Determines the resizability of the view along the given axis.voidinsertUpdate(DocumentEvent changes, Shape a, ViewFactory f)Gives notification that something was inserted into the document in a location that this view is responsible for.ShapemodelToView(int pos, Shape a, Position.Bias b)Provides a mapping from the document model coordinate space to the coordinate space of the view mapped to it.voidpaint(Graphics g, Shape a)Renders using the given rendering surface and area on that surface.voidremoveUpdate(DocumentEvent changes, Shape a, ViewFactory f)Gives notification that something was removed from the document in a location that this view is responsible for.intviewToModel(float fx, float fy, Shape a, Position.Bias[] bias)Provides a mapping from the view coordinate space to the logical coordinate space of the model.-
Methods inherited from class javax.swing.text.PlainView
changedUpdate, damageLineRange, drawLine, drawSelectedText, drawUnselectedText, getLineBuffer, getTabSize, lineToRect, nextTabStop, setSize, updateDamage, updateMetrics
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Methods inherited from class javax.swing.text.View
append, breakView, createFragment, forwardUpdate, forwardUpdateToView, getAlignment, getAttributes, getBreakWeight, getChildAllocation, getContainer, getDocument, getElement, getEndOffset, getGraphics, getMaximumSpan, getMinimumSpan, getNextVisualPositionFrom, getParent, getStartOffset, getToolTipText, getView, getViewCount, getViewFactory, getViewIndex, getViewIndex, insert, isVisible, modelToView, modelToView, preferenceChanged, remove, removeAll, replace, setParent, updateChildren, updateLayout, viewToModel
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Constructor Detail
FieldView
public FieldView(Element elem)
Constructs a new FieldView wrapped on an element.- Parameters:
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elem- the element
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Method Detail
getFontMetrics
protected FontMetrics getFontMetrics()
Fetches the font metrics associated with the component hosting this view.- Returns:
- the metrics
adjustAllocation
protected Shape adjustAllocation(Shape a)
Adjusts the allocation given to the view to be a suitable allocation for a text field. If the view has been allocated more than the preferred span vertically, the allocation is changed to be centered vertically. Horizontally the view is adjusted according to the horizontal alignment property set on the associated JTextField (if that is the type of the hosting component).- Parameters:
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a- the allocation given to the view, which may need to be adjusted. - Returns:
- the allocation that the superclass should use.
paint
public void paint(Graphics g, Shape a)
Renders using the given rendering surface and area on that surface. The view may need to do layout and create child views to enable itself to render into the given allocation.- Overrides:
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paintin classPlainView - Parameters:
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g- the rendering surface to use -
a- the allocated region to render into - See Also:
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View.paint(java.awt.Graphics, java.awt.Shape)
getPreferredSpan
public float getPreferredSpan(int axis)
Determines the preferred span for this view along an axis.- Overrides:
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getPreferredSpanin classPlainView - Parameters:
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axis- may be either View.X_AXIS or View.Y_AXIS - Returns:
- the span the view would like to be rendered into >= 0. Typically the view is told to render into the span that is returned, although there is no guarantee. The parent may choose to resize or break the view.
- See Also:
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View.getPreferredSpan(int)
getResizeWeight
public int getResizeWeight(int axis)
Determines the resizability of the view along the given axis. A value of 0 or less is not resizable.- Overrides:
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getResizeWeightin classView - Parameters:
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axis- View.X_AXIS or View.Y_AXIS - Returns:
- the weight -> 1 for View.X_AXIS, else 0
modelToView
public Shape modelToView(int pos, Shape a, Position.Bias b) throws BadLocationException
Provides a mapping from the document model coordinate space to the coordinate space of the view mapped to it.- Overrides:
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modelToViewin classPlainView - Parameters:
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pos- the position to convert >= 0 -
a- the allocated region to render into -
b- the bias toward the previous character or the next character represented by the offset, in case the position is a boundary of two views;bwill have one of these values:Position.Bias.ForwardPosition.Bias.Backward
- Returns:
- the bounding box of the given position
- Throws:
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BadLocationException- if the given position does not represent a valid location in the associated document - See Also:
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View.modelToView(int, java.awt.Shape, javax.swing.text.Position.Bias)
viewToModel
public int viewToModel(float fx, float fy, Shape a, Position.Bias[] bias)Provides a mapping from the view coordinate space to the logical coordinate space of the model.- Overrides:
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viewToModelin classPlainView - Parameters:
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fx- the X coordinate >= 0.0f -
fy- the Y coordinate >= 0.0f -
a- the allocated region to render into - Returns:
- the location within the model that best represents the given point in the view
- See Also:
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View.viewToModel(float, float, java.awt.Shape, javax.swing.text.Position.Bias[])
insertUpdate
public void insertUpdate(DocumentEvent changes, Shape a, ViewFactory f)
Gives notification that something was inserted into the document in a location that this view is responsible for.- Overrides:
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insertUpdatein classPlainView - Parameters:
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changes- the change information from the associated document -
a- the current allocation of the view -
f- the factory to use to rebuild if the view has children - See Also:
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View.insertUpdate(javax.swing.event.DocumentEvent, java.awt.Shape, javax.swing.text.ViewFactory)
removeUpdate
public void removeUpdate(DocumentEvent changes, Shape a, ViewFactory f)
Gives notification that something was removed from the document in a location that this view is responsible for.- Overrides:
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removeUpdatein classPlainView - Parameters:
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changes- the change information from the associated document -
a- the current allocation of the view -
f- the factory to use to rebuild if the view has children - See Also:
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View.removeUpdate(javax.swing.event.DocumentEvent, java.awt.Shape, javax.swing.text.ViewFactory)
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